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Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Instrumentation und Anwendungen I

HK 37.3: Talk

Thursday, March 13, 2008, 17:15–17:30, 2C

Measurement of transverse emittance at the source of spin-polarized electrons at the S-DALINAC* — •Christian Eckardt1, Wolfgang Ackermann2, Roman Barday1, Uwe Bonnes1, Ralf Eichhorn1, Joachim Enders1, Christoph Hessler1, Wolfgang F.O. Müller2, Oleksandr Patalakha1, Markus Platz1, Yuliya Poltoratska1, Wolfgang Rick1, Bastian Steiner2, and Thomas Weiland21Institut für Kernphysik, TU Darmstadt — 2Institut für Theorie Elektromagnetischer Felder, TU Darmstadt

A new injector concept for 100 keV spin-polarized electrons (SPIN) at the S-DALINAC has been developed. The transverse emittance was measured for beam characterization. The emittance is a quantity concerning the quality of the beam, describing the phase space area. Determination of the emittance requires measurement of the beam profile and knowledge of the focal length of a beam focussing device.

A wire scanner unit consisting of two 50 µm diameter tungsten wires is used for the beam-profile measurement. Data analysis is performed by fitting a gaussian model distribution to estimate the 1σ beam radius. Each determined beam width is correlated to the corresponding focal length of a magnetic lens, and a parabola fit is applied to calculate the parameters of the σ-matrix. The square root of the determinant of the σ-matrix defines the emittance. The results of the calculation are presented and the emittance is compared to theoretical estimates.

*Supported by DFG through SFB 634.

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